Slotted Peritoneal Catheter Design for Outflow Failure
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Solution Overview
Problem
Current peritoneal dialysis catheters suffer from outflow failure, leading to incomplete drainage and increased hydraulic resistance due to small side-holes that cause omental attachment and 'ball-valve' effects, resulting in slow and unpredictable fluid flow, which complicates dialysis therapy and is a common cause of catheter failure.
Innovation Solution
Designing peritoneal catheters with slot-shaped outflow ports instead of traditional side-holes, featuring a single large internal lumen and material bridges to maintain the cylindrical shape, reducing hydraulic resistance and promoting higher flow rates while minimizing omental attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional side-holes are used in peritoneal dialysis catheters, then the catheter structure is simple, but outflow failure occurs due to omental attachment and ball-valve effects, resulting in slow and unpredictable fluid flow
Solution Approach 1:
The catheter is divided into distinct functional segments: a slotted distal portion for fluid exchange, a curled intermediate portion for positioning, and a proximal portion for connection. The slotted portion is further segmented into multiple longitudinal slots arranged in rows, creating multiple independent flow pathways that prevent complete occlusion by omental tissue.
Solution Approach 2:
The invention transitions from traditional circular side-holes to elongated linear slots, changing the dimensional characteristics of the outflow ports. This dimensional change from point-like holes to line-like slots increases the surface area for fluid exchange and reduces the likelihood of complete blockage by omental attachment.
2Quantity of substance
If small side-holes are used in the catheter, then the catheter material usage is minimized, but hydraulic resistance increases due to omental attachment, causing slow fluid flow
Solution Approach 1:
The invention changes the geometric parameters of the outflow ports from small circular holes (typically 0.5-0.75 mm diameter) to elongated slots with larger surface area. The slots are configured with specific dimensions (e.g., 0.5-2.0 mm width and 5-20 mm length) to optimize the balance between material usage and hydraulic resistance reduction.
3Device complexity
If traditional side-holes are used, then the catheter design is conventional, but omental attachment occurs leading to ball-valve effects and incomplete drainage
Solution Approach 1:
The catheter employs asymmetric design elements including a curled intermediate portion that creates a specific spatial configuration, and slotted portions with slots arranged in rows at different orientations. This asymmetric geometry prevents symmetric omental attachment and reduces the ball-valve effect by ensuring fluid can escape through multiple directions.
Solution Approach 2:
The invention acknowledges that some omental attachment is inevitable but converts this potential harm into a benefit by designing slots that allow controlled interaction with omental tissue. The elongated slot geometry permits partial attachment while maintaining adequate flow pathways, and the curled configuration positions the slots to minimize problematic attachment patterns.
4Productivity
If slot-shaped ports are used instead of side-holes, then hydraulic resistance is reduced and flow rates increase, but the catheter structure becomes more complex
Solution Approach 1:
The catheter is divided into distinct functional segments: a slotted distal portion for fluid exchange, a curled intermediate portion for positioning, and a proximal portion for connection. The slotted portion is further segmented into multiple longitudinal slots arranged in rows, creating multiple independent flow pathways that prevent complete occlusion by omental tissue.
Solution Approach 2:
The slotted catheter design serves multiple functions simultaneously: the elongated slots provide both increased flow area and reduced hydraulic resistance, while the curled configuration provides both positioning stability and flow direction control. The single catheter structure integrates features that address multiple clinical requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The slotted catheter design achieves significantly higher flow rates and more complete drainage, reducing the incidence of outflow failure and allowing for more efficient and predictable peritoneal dialysis, suitable for both manual and automated systems, as well as applications like Hyperthermic Intraperitoneal Chemotherapy.
Implementation Method 1
reducing hydraulic resistance and promoting higher flow rates
Implementation Method 2
minimizing omental attachment
Data Source
AI summary
Methods and design for a Slotted T-shaped PD Catheter are disclosed. The present invention includes a unique port design for peritoneal dialysis catheters that allows high outflow and inflow rates, with a minimum fluid velocity through the fluid entry ports. Features of this device include T-shaped catheter with subcutaneous tubing joining to an intraperitoneal portion that is essentially at right angles to the intraperitoneal tubing and slit shaped flow ports as opposed to round shaped flow ports.